Issue 46 / April 14, 2016Editor's Note from April 14, 2016Issue 46: Gorgeous feathers, Cairo’s cave churches, ant trails, and clouds. / Ted Olsen Simply Beautiful FeathersA display of birds’ useful adornments. / Photos and text by Robert Clark From Garbage to GloryThe cave churches of Cairo offer sanctuary in the midst of squalor. / Text and photos by Jayson Casper Not All Who Wander Are LostHow ants have solved the Traveling Salesman Problem. / Andy Walsh Under the CloudFive amazing facts about the fluffy, immense formations above our heads. / Rebecca Randall Wonder on the WebIssue 46: Links to amazing stuff.